A SYSTEM OF 
•a 20 
it IS likewife fo often equally mixed with the faid 
copper and lead ores, as not to be eaiily perceived, 
if one is not previoufly acquainted with them. It 
leems, neverthelefs, reafonable, that a true mine- 
ralift ought rather to fufpedl the ore called Braun-^ 
bleygrtz (Se6r. ccxxx.) to be a zink ore, than to 
fuppofe this fe mi-metal to be a product of l^ad, 
copper, and iron, 
SECT, ccxxxn. 
4; Antimony, Antimonium, Stibium, This femi- 
metal is 
a. Of a white colour almofl like filven 
h. Brittle ; and in regard to its texture, it 
confilts of Ihining planes, of greater length 
than breadth. 
€, In the fire it is volatile, and volatilifes part of 
the other metals along with it, except gold 
and platina. It miay, however, in a mode- 
rate fire be calcined into a light grey calx, 
which is pretty .refraftory in the fire, but 
melts at laft to a glafs of a reddifli brown 
colour. 
It dififolves in fpirit of fea-falt and aqua 
regia, but is only corroded by the fpirit of 
nitre into a white calx ; it is precipitated 
out of the aqua regia by water. 
e. It has an emetic quality when its calx, 
glafs, or metal, is dififolved in an acid, 
except when in the fpirit of nitre, which 
has not this effedl. 
/. It amalgamates with quickfilver, if the re^- 
gulus, when fufed, is put to it ; but the 
quickfilver ought for this purpofe to be 
covered with warm water : It amalgamates 
with 
